Wireless telegraphy.



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TELEGRPHY.

Specification of Letters Patent.

atenteti Een,

eppicaticnnei'i Hacer-aber G, 1919.. Serial No. 735,329.

T0 aZZ 'whom t may concern:

Be it known that I, Loris Taoism-ron, of 63 Boulevard Haussmann, Paris, France, have invented certain new and useful linprovements in and Relating to Tlf'ireless Te legraphy, of which the following is a full specification.

This invention relates toiinproveincnts in Wireless telegraphy and has for its object the taking' advantage of certain known results in the distribution of alternating currents for enabling the provision in. the saine instrumentalities ci two receptions one with loose coupling and the other with tight conpling.

With this and further objects in View as` will. hereinafter in part be stated anol in part become apparent, the invention comprises certain novel constructions, combinations and arrangements of parts as will he hereinafter specified and claimed.

ln the accompanying drawing: Figure l is an illustrative diagram. Fig. 2 is a diagrainmatic View of a set of Wireless telegra phy receiving instruments.

Referring to the drawing by reference characters, and particularly to Fig, l., an alternating current circuit A, B, is provided and divided into two branches, one consisting of B, C and D, thus including the con.- cienser C, and the other of B, S and. E incluriing the induction coil S. As is known in theart, when C ami S are varied so, that the circuit B, C, B, S, B is tuned with the alternating current, the intensity oic said eurrent becomes zero in line A., B, if the ohniic resistances of the .circuits B, C, 'D and il, S, D are sutliciently small to he considered negligible. parts in actual practice are not infinitesimal and in consequence the closed-circuit B, C, D, S, B presents to the passage of alternating current a Very high resistance in lieu of an infinite resistance. This action of an alternating current is known, and has been used as applied in Wireless telegraphy to decrease, at the reception, the etl'ect of eddycurrents from Stone, tleance and Colin, etc., for the ltration of the Waves). it is possible to apply this property of alternating curn rents in a very advantageous antiquite dit`- ferent nmnner will he later speciiieti.

.Referring to' Fifi. il ci the iirawing l. indi- Cates an antenna, D the self iiafluction coil of the antenna which :may he variable or not,

But the ohinic resistance of these E a variable self induction coil, F anti (l vaduction coil which may he Variable or not .il the detector, M a lined condenser, 'L the l phone and N a twoway switch. l?

ith this arrangement of elements it is ipossihle to secure two receptions, one with loose coupling ancl. the other with tight coupling.' The are tenne circuit consists ot" A, it, D, B, lil, l?, H and may he tuncci to receive either hy ineens of self induction coii D or hij the condenser l?. v

The secondary circuit of the reception with loose coupling consists olf E, l, C, t1 S, E, B and is coupled with the antenna rii-l rectly by B, E.

The detector circuit consists either o? L, M, N, l?, Q, S, E, Il or 'of B, M Ti, R, E, Closing the switch. lil 'to contact point Q affords the position of parte in sar,7 for the reception Vith tight coup or bus reception prepared. to receive signals of all kinds without regulation, though sus ceptilole of heing regulated alter Warning, whereby a maximum lnumber of collections may be obtained and superfluous signals eliminated. The advantage of mount ing resides in the Jfact that it is possible to prepare the reception with loose couplings when on the bus reception anti in fact the switch N, being in the position N, anni the antenna. havingheen tunecl with the trans mittingstation, it the capacity et condenser C or the self induction coil or hoth. is varied in order to gire to circuit B, it, (jv M g? E the oscillations to which the antenna is tuned, the current will he cut ofi in the antenna. lhe result will he the same as iif'the antenna was untuneti, and almost no sound. will be perceived in the telephone. Thus, in

practice, when the position of the condenser l, in which no sound is received or rlistrih uted to the telephone, has been determined, the tuning of the secondary circuit with the antenna will he realized and it will only he necessary to place the switch N in the posi- `tion N il to he in the exact conditions required for the reception with loose coupling. Another advantage oi" the structure, as seen in Fig. 2, resides in the fact that it is hie to choose in advance 'the tie@T @ling oi'f the antenna with the i-seconriaofiT cuit, according; to tlc tuning decree clesi Moreover,

v. a ousiy eoljusting lelle receiver or eflclenn re* eepzion' which consists in listening 1n over a l iiglx coupling so as o detect all frequencies received, simultaneously offering to the pas sage of the currents the large resistance produced by a slightly damped circuit loosely coupled to the receiving circuit and tuned to the frequency of the Waves which it is de.- sired to receive by adjusting such clrcuituntil the energy of the desired frequency which reaches the telephone over the tight coupling becomes n minimum, and then listening in over the loose coupling.- In testimony whereof have slgned name to this specification, in the presence of 30 two subscribing witnesses.

LOUIS TRONCHON.

Witnesses AUBOUIN MONTEILBET, LUCIEN MEMMINGER. 

